Who DOESN'T analyze their gas?

[Superlyte27]

LOL, you guys are hilarious.

PfcAJ asks the right question. Suddenly because altitude is higher, we're breathing 18% O2 and 82% Nitrogen? Do the trees not work as well up there converting CO2 into O2? Now, if someone had said the O2 content in Detroit was less than 21% that would be believable.

[gschaut]

What I've always wondered is what happens to very active divers blood count? Specifically the red blood cell count? People acclimatize to high altitudes by their bodies increasing the amount of red blood cells, I think it can as much as double.
What happens to people that spend a lot of time in high PO2? Does their red blood cell count drop? I'm talking people that spend say four or more hours diving at least five days a week, not weekend warriors like me.

http://www.ncbi.nlm.nih.gov/pubmed/11908696

In saturation divers, there is a significant drop in blood numbers. I did not find any abstracts for rec or tec divers.

[CaveMD]

http://www.ncbi.nlm.nih.gov/pubmed/11908696

In saturation divers, there is a significant drop in blood numbers. I did not find any abstracts for rec or tec divers.

2nded

Physiologically it makes perfect sense as well. People with chronic respiratory problems are another interesting situation. Frequently copd patients will have an elevated hgb/hct from chronic hypoxia, provided they don't have renal disease as well(kidneys are involved in epo production which is needed to stim rbc proliferation).

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[CaveMD]

I'm no Doc, and I didn't stay in any motel last night, but isn't it white cell count they look at with some forms of cancer?
Somebody has to know the answer, it's just too easy a thing to check to have not been checked?

Maybe, depends on what kind of cancer. You can get a cancer originating from literally ANY cell type in the body. The difference in types of cancer is which cell type it originated from. The human body is essentially a highly effective socialist regime with the central nervous center pulling societies strings. Every once in a while a certain cell line may say #### this ####, I'm going rogue. Most of the time the body recognizes this and kills the rogue before it has time to proliferate.

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[Paulmal]

Maybe, depends on what kind of cancer. You can get a cancer originating from literally ANY cell type in the body. The difference in types of cancer is which cell type it originated from. The human body is essentially a highly effective socialist regime with the central nervous center pulling societies strings. Every once in a while a certain cell line may say #### this ####, I'm going rogue. Most of the time the body recognizes this and kills the rogue before it has time to proliferate.

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Love this description. Kind like Egypt.

[kwinter]

I'm no Doc, and I didn't stay in any motel last night, but isn't it white cell count they look at with some forms of cancer?

It's called leukemia

[gschaut]

LOL, you guys are hilarious.

PfcAJ asks the right question. Suddenly because altitude is higher, we're breathing 18% O2 and 82% Nitrogen? Do the trees not work as well up there converting CO2 into O2? Now, if someone had said the O2 content in Detroit was less than 21% that would be believable.

No, the problem is that Oxygen analizers DO NOT measure PERCENTAGE of oxygen. Even though that is the value displayed.

Oxygen analizers measure the PARTIAL PRESSURE IN ATMOSPHERES of oxygen.

At 3,000' above sea level, the TOTAL air pressure is about 850 mBar. Or about 85% of sea level air pressure.

At sea level, 21% oxygen is equal to 210 mBar Partial Pressure. BUT... at 3,000', 21% oxygen is only 185 mBar Partial Pressure.

So the oxygen analizer reads 18.5% instead of 21%.

This is why we have to calibrate the O2 analizer every time it's used. Altitude, Temperature and Humidity ALL affect the PPO2 in the atmosphere.

Each analizer has a calibration chart for Temp and Humidity. Sea level (or near sea level) altitude is assumed. If you are doing "altitude" diving, you can either use math to calibrate the difference in PPO2 caused by air pressure.

OR... you can just bring an tank of "bump gas" (known value, pre-calibrated gas) with you to calibrate your analizer.

[spelodiver]

The last couple of analizers I have used were hooked to the low pressure port on a scuba reg. with a pre set amount of gas flowing through it at 130 to 150 psi. I would think this will negate the altitude effect and display the proper cal. So at sea level it will (should) read 20.9 and at 5000 ft it should read around 18 when reading the ambient air, but when you hook it to a tank with air it will (should) read 20.9 and just as at sea level it will read what ever nitrox mix was mixed and installed into the tanks.....

My 2c

[MichaelAngelo]

so if a Egyptian with leukemia and a socialist spinial cord analizes his gas in Denver then it's 18% before he passes out from screaming **** *** **** in arabic which in English translates to **** *** ****.

[JTB]

when im in cave country I dont usually analyze the banked nitrox fills but always my trimix fills even if its banked.Up north here most shops have air fills only and if im getting 2-3 tanks filled i will usually only check one,, i guess now ill start using the analyzers i own a little more.